gistfile1.txt

abstract class SocialAuth
{
    protected $id, $key, $url, $token, $userId, $service;

    public function setParams($id, $key, $url)
    {
        $this->id = $id;
        $this->key = $key;
        $this->url = $url;
    }

    public abstract function getAuthUrl();
    public abstract function tryLogin($code);
    public abstract function getUserInfo();

    protected function getUrlJson($url, $method = 'get')
    {
        $response = json_decode($this->getUrl($url, $method), true);
        return $response;
    }

    protected function getUrl($url, $method = 'get')
    {
        if($method == 'post')
        {
            $urlParts = explode('?', $url);
            $ch = curl_init($urlParts['0']);
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $urlParts['1']);
        }
        else
        {
            $ch = curl_init($url);
        }
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }

    protected function getOutput($userId, $nickname, $birthday, $email, $firstName, $lastName, $sex, $photo)
    {
        return Array(
            'identity' => $this->service.$userId,
            'nickname' => $nickname,
            'birthday' => $birthday,
            'email' => $email,
            'firstName' => $firstName,
            'lastName' => $lastName,
            'sex' => $sex,
            'photo' => $photo
        );
    }
}

class SocialAuthVk extends SocialAuth
{
    public function __construct()
    {
        $this->service = 'vk.com/';
    }

    public function getAuthUrl()
    {
        return "https://oauth.vk.com/oauth/authorize?redirect_uri={$this->url}&client_id={$this->id}";
    }

    public function tryLogin($code)
    {
        $url = "https://oauth.vk.com/access_token?client_id={$this->id}&redirect_uri={$this->url}&client_secret={$this->key}&code=".$code;
        $data = $this->getUrlJson($url);
        if(!isset($data['access_token']) || $data['access_token'] == '')
            return false;
        if(!isset($data['user_id']) || $data['user_id'] == '')
            return false;

        $this->token = $data['access_token'];
        $this->userId = $data['user_id'];

        return true;
    }

    public function getUserInfo()
    {
        $url = "https://api.vk.com/method/getProfiles?uid={$this->userId}&access_token={$this->token}&fields=uid,first_name,last_name,nickname,screen_name,sex,bdate,city,country,timezone,photo,photo_medium,photo_big,has_mobile,rate,contacts,education,online,counter";
        $data = $this->getUrlJson($url);
        if(!isset($data['response']['0']) || !isset($data['response']['0']['uid']))
            return false;
        if(!isset($data['response']['0']['screen_name']))$data['response']['0']['screen_name'] = '';
        if(!isset($data['response']['0']['bdate']))$data['response']['0']['bdate'] = '';
        if(!isset($data['response']['0']['first_name']))$data['response']['0']['first_name'] = '';
        if(!isset($data['response']['0']['last_name']))$data['response']['0']['last_name'] = '';
        if(!isset($data['response']['0']['sex']))$data['response']['0']['sex'] = '2';
        if(!isset($data['response']['0']['photo_big']))$data['response']['0']['photo_big'] = '';

        return $this->getOutput(
            $data['response']['0']['uid'],
            '',
            $data['response']['0']['bdate'],
            '',
            $data['response']['0']['first_name'],
            $data['response']['0']['last_name'],
            $data['response']['0']['sex'] == '2' ? 'M' : 'F',
            $data['response']['0']['photo_big']
        );
    }
}